Pumping jack



' Nov. 9 1926.

w. R. BARNEY PUMPING JACK Filed July 29, 1926 IN V EN TOR;

ATTORNEYS.

Patented Nov, 9, 1925,

UNITED STATES PATENT WILLIAM It. BARNEY, OF TULSA, GKLAHOMA, ASfiIGNOR TO VJLYLBUR U. NGRRIQ, U1?

TULSA, OKLAHOMA.

PUMPING JACK.

Application filed July 29,

This invention is designed to improve pumping jacks by varying the leverage on the jack in different portions of the stroke so that the ack may have a greater leverage in starting the pumping action and make up the variation in movement by a lesser leverage but greater travel inthe later parts of the movement of the jack. Features and details of the invention will appear from the specification and claims;

The invention is illustrated in the acconr panying drawings as follows Fig. 1 shows a side elevation of the jack.

FM. 2 a perspective view of the trunnion fitting of the jack.

3 a perspective view of the saddle.

1 marks the base of the device, 2 the standing post, 3 the brace between the base and the post, and l the walking beam. A saddle 5 has the two trunnion bearing receiving sockets 6 and 7, the socket 6 being nearer the lifting end of the jack than the socket 7.

The jack has the jack frame 8 and the lifting end 9 from which a thrust rod 10 extends to the walking beam 4. A trunnion fitting 11 has perforated ears 12 which are secured to the frame by bolts 13. The fitting has trunnions i l and 15 which are adapted to alternately engage and rock in the bearing sockets 6 and 7.

In the operat on of the device the initial lifting movement starts with the trunnion 145; in engagement with the bearing socket 6, thus giving an increased leverage but less travel to the lifting end of the jack. After the inertia of the column of liqui d and the rods has been overcome in the lifting movement the trunnions 15 drop into the sockets 7 and the added travel necessary to give the full stroke of the pump is thus provided.

I prefer to joint the sockets 7 and 6 with surface 17 and the wall of the fitting 11 connecting the trunnions 14 and 15 has a surface 16 shaped to conform to the surface 17 so that as the weight is transferred from one trunnion to the other a part of the shock is taken by these surfaces 16 and 17.

1926. Serial No. 125,674.

What I claim as new is 1. In a pumping jack, the combination of a base; a jack frame; and a fulcrum connection presenting variable pivotal bearings between the frame and base, one more remote from the lifting end of the frame than the other, said connection varying the rocking pivot of the connection from a point nearer the lifting end of the frame at the beginning of the stroke to a point more remote from the lifting end of the frame as the frame rocks in the lift ng movement.

2. In a pumping jack, the combination of a base; a jack frame; and a fulcrum connection between the frame and base, said connection varying the rocking pivot of the conneciion, said connection comprising a saddle having two bearing members, one more remote from the lifting end of the frame than the other, and bearing members on the frame alternately operating with the bearing members of the saddle.

3. In a pumping jack, the combination of a base; a jack frame; and a fulcrum connection between the frame and base, said connection varying the rocking pivot of the connection, said connection comprising a saddle having two bearing sockets, one more remote from the lifting end of the frame than the other, and bearing trunnions on the frame alternately operating in said sockets 4;. In a pumping jack, the combination of a base; a jack frame; and a fulcrum connection between the frame and base, said connection varying the rocking pivot of the connection, said connect on comprising a saddle having two bearing members, one more re mote from the lifting end of the frame than the other, and bearing members on the frame alternately operating with the bearing members of the saddle, said connection having bearing surfaces between the bearing mem bers engaged as the weight on the bearing members shifts through the rocking of the frame.

In testimony whereof I have hereunto set my hand.

WILLIAM R. BARNEY. 

